BudsGunShop.com - Keyhole lock?

If you look at this model on the sw website, it does show the key hole lock. You will have to look at the used market for older generations of this gun if you want a Model 66 with out an internal lock.

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BRAND: Smith & Wesson # OF MAGS:
MODEL: Model 66 Combat Magnum SAFETY: Internal Lock
TYPE: Revolver: Double Action SIGHTS: Front: Red Ramp Rear: White Outline Adjustable
CALIBER: 357 BARREL: 2.75
FINISH: Glass Bead Stainless Steel OVERALL LENGTH: 7.75
ACTION: Double Action WEIGHT: 36.6 oz
STOCK: Synthetic Grip PACKAGING:
CAPACITY: 6 FEATURES: Full Top Strap And Barrel Serration
CHOKES: FEATURES: 2-Piece Barrel, Ball Detent Lock Up